"Wrong Pattern" After Flashing Image

Question

I wanted to update my OnePlus 3 to OxygenOS 4 using TWRP but that resulted in an error. I tried again, same error. I flashed the old image again, no error, phone was usable again, updated TWRP, flashed the new image again, different error. I then flashed the old image, again, no error.



However, my phone isn't usable right now because I can't unlock it. I definitely remember my pattern, I had it since I bought my the OnePlus 3 and I bought it right when it came out. I have to enter it every time I reboot so I entered it several times just today and there is just no way I remember it incorrectly. Furthermore, I have a second phone with the same pattern. I drew it on both phones simultaneously and only the other phone unlocked.



How can I log into my phone, again?


— UTF-8 | Sources

Answer

Note that @dan-brown seems to be right about the root cause of the issue - it looks like a corrupt install after flashing a new TWRP.



However there is a non-destructive fix, as documented here.




  1. Boot into recovery

  2. Navigate to /data/system

  3. Delete the following files:


    1. password.key

    2. pattern.key

    3. locksettings.db

    4. locksettings.db-shm

    5. locksettings.db-wal


  4. Reboot


— Seb Charrot | Sources

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